Daily Report for 25th February 2021

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 5.5 °C (+3.0) 23:56 3.6 °C (+1.4) 8.1 °C (+5.6), 2009 -1.6 °C (-4.1), 2016
Maximum Temperature 12.7 °C (+4.3) 00:36 8.1 °C (+0.6) 17.5 °C (+9.2), 2019 3.7 °C (-4.6), 2018
Mean Temperature 10.2 °C (+3.7) 6.1 °C (+1.0) 11.1 °C, 2011 1.0 °C, 2018
Minimum Humidity 61% 15:50 73% 84%, 2010 32%, 2019
Maximum Humidity 87% 10:52 90% 98%, 2010 79%, 2012
Mean Humidity 77% 82% 95%, 2010 65%, 2012
Minimum Pressure 1022 hPa 02:47 1010 hPa 1035 hPa, 2019 978 hPa, 2010
Maximum Pressure 1035 hPa 23:56 1017 hPa 1038 hPa, 2019 991 hPa, 2010
Mean Pressure 1028 hPa 1013 hPa 1037 hPa, 2019 984 hPa, 2010
Mean Wind Speed 3.5 mph (-1.6) 6.1 mph (+1.0) 9.0 mph, 2017 1.7 mph, 2019
Maximum Wind Speed 16.7 mph 00:48 14.8 mph 17.8 mph, 2014 8.9 mph, 2019
Maximum Gust 25.1 mph 00:43 22.7 mph 27.6 mph, 2020 11.5 mph, 2019
Mean Wind Direction WNW
Rainfall 0.2 mm 40.3 mm (110%) 7.4 mm, 2010
Maximum Hourly Rain 0.2 mm 2.5 mm, 2010
Maximum 10-min Rain 0.2 mm 0.8 mm, 2010
Maximum Rain Rate n/a 6, 2010
Minimum Dew Point 2.1 °C 23:50 1.0 °C 6.0 °C, 2011 -7.5 °C, 2018
Maximum Dew Point 9.3 °C 04:37 5.1 °C 10.6 °C, 2011 -2.4 °C, 2018
Mean Dew Point 6.3 °C 3.2 °C 8.3 °C, 2011 -5.0 °C, 2018
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 9.5 °C * 08:55 4.3 °C 9.5 °C, 2021 -1.3 °C, 2016
Day Maximum (09-21) * 11.6 °C * 14:09 7.9 °C 17.5 °C, 2019 3.7 °C, 2018
Max 10m Temp Rise 0.3 °C 13:23 0.4 °C 0.8 °C, 2019 0.1 °C, 2013
Max 1hr Temp Rise 0.9 °C 13:23 1.2 °C 3.0 °C, 2019 0.5 °C, 2009
Max 1hr Hum Rise 6% 17:35 6% 16%, 2019 3%, 2011
Max 10m Temp Fall 0.5 °C 05:26 0.3 °C 0.8 °C, 2020 0.1 °C, 2013
Max 1hr Temp Fall 1.5 °C 20:09 0.9 °C 2.7 °C, 2019 0.4 °C, 2013
Max 1hr Hum Fall 13% 13:58 7% 17%, 2019 5%, 2017
Max 10m Wind Speed 14.2 mph 00:51 11.7 mph 14.2 mph, 2021 5.8 mph, 2016
Minimum Feels-like 4.7 °C 22:42 -0.6 °C 5.4 °C, 2011 -7.5 °C, 2018
Maximum Feels-like 13.2 °C 00:47 7.9 °C 17.5 °C, 2019 0.1 °C, 2018
Mean Feels-like 10.2 °C 3.9 °C 11.2 °C, 2011 -4.0 °C, 2018
Air-frost Hrs 0 hrs 5 hrs 8 hrs, 2018 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 7.2 °C (+1.3) 4.6 °C (-0.7) 15.7 °C (+9.8), 2019 1.3 °C (-4.6), 2009
Humidity Range 26% 17% 60%, 2019 13%, 2009
Pressure Range 12 hPa 7 hPa 13 hPa, 2010 2 hPa, 2009
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 0 [0%]32 hrs (48%) [14%] 9.5 [100%], 2018 0 [0%], 2009
Wet Hours 157 hrs (123%) [9.5%] 6, 2010 , 2009
Cloud Cover unknown
Events None
Comments blr
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 4.5 °C
Notes
Times of extremes are computed using the midpoint of the longest continuous period at that extreme value.
Cumulative anomalies are reported according to the expected value for the month-to-date rather than month-end.
Sun hrs are initially pulled from the official weather station at Heathrow, and later adjusted by hand to reflect local conditions based on webcam observations. Wet hrs are dervied algorithmically from rainfall data, though may be adjusted manually. Cloud cover and Events are manually reported, often with multi-week delays.
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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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Wind rose